Sagittal MRI slides, in both T2 sequence and T1 sequence: From anterior to posterior: bladder (half full), cystic mass with hypoT2 debris, then large bowel with rectal pouch (containing bright hyperT1 meconium) located far away from the perineal skin.
Coronal and axial T1 sequence findings: the meconium appears bright and is contained in the rectal pouch way above the perineal area. Both the bladder and the cystic mass do not show meconial content.
Coronal and axial T2 sequence findings: From anterior to posterior: bladder, then pelvic cystic mass with midline septum, followed by small cystic images on the upper pole, and ascites. In a female fetus, the cystic mass is assumed to be an hydrometrocolpos with complete septum separating 2 vaginas (“big cystic mass”) and 2 uterine horns (“small cystic images on the upper poles”). The ascites is thought to be secondary to fluid leakage through tubes.
The last image shows mild pelvic and caliceal dilation of both kidneys.